Moved Log2 to common.h and added profiler skeleton
added TODO to fix memleak
added profiler to thread cache. Default OFF
added profiler.cc to Makefile
profiler is now part of threadcache
added profiler probes to slab allocator
Merge branch 'master' into profiler

Conflicts:
	src/allocators/slab_sc_allocator.h
	src/common.h
	src/thread_cache.cc